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<ol class="breadcrumb">
  <li class="breadcrumb-item">Classes</li>
  <li class="breadcrumb-item" >HashHandler</li>
</ol>

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            <a href="#info" 
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        <p class="comment">
            <h3>File</h3>
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        <p class="comment">
            <code>projects/lib/src/token-validation/hash-handler.ts</code>
        </p>


            <p class="comment">
                <h3>Description</h3>
            </p>
            <p class="comment">
                <p>Abstraction for crypto algorithms</p>

            </p>




            <section data-compodoc="block-index">
    <h3 id="index">Index</h3>
    <table class="table table-sm table-bordered index-table">
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                <tr>
                    <td class="col-md-4">
                        <h6><b>Methods</b></h6>
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                <tr>
                    <td class="col-md-4">
                        <ul class="index-list">
                            <li>
                                    <span class="modifier">Abstract</span>
                                <a href="#calcHash" >calcHash</a>
                            </li>
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            <section data-compodoc="block-methods">
    
    <h3 id="methods">
        Methods
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                <td class="col-md-4">
                    <a name="calcHash"></a>
                    <span class="name">
                            <span class="modifier">Abstract</span>
                        <span ><b>calcHash</b></span>
                        <a href="#calcHash"><span class="icon ion-ios-link"></span></a>
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                        <span class="modifier-icon icon ion-ios-reset"></span>
                    <code>calcHash(valueToHash: <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/string" target="_blank">string</a>, algorithm: <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/string" target="_blank">string</a>)</code>
                </td>
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                    <tr>
                        <td class="col-md-4">
                            <div class="io-line">Defined in <a href="" data-line="12"
                                    class="link-to-prism">projects/lib/src/token-validation/hash-handler.ts:12</a></div>
                        </td>
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            <tr>
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                            <div class="io-description">
                                <b>Parameters :</b>
                                
                                <table class="params">
                                    <thead>
                                        <tr>
                                            <td>Name</td>
                                                <td>Type</td>
                                            <td>Optional</td>
                                        </tr>
                                    </thead>
                                    <tbody>
                                        <tr>
                                                <td>valueToHash</td>
                                            <td>
                                                            <code><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/string" target="_blank" >string</a></code>
                                            </td>

                                            <td>
                                                    No
                                            </td>


                                        </tr>
                                        <tr>
                                                <td>algorithm</td>
                                            <td>
                                                            <code><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/string" target="_blank" >string</a></code>
                                            </td>

                                            <td>
                                                    No
                                            </td>


                                        </tr>
                                    </tbody>
                                </table>
                            </div>
                        <div class="io-description">
                            <b>Returns : </b>    <code>Promise&lt;string&gt;</code>

                        </div>
                            <div class="io-description">
                                
                            </div>
                </td>
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    <div class="tab-pane fade  tab-source-code" id="source">
        <pre class="line-numbers compodoc-sourcecode"><code class="language-typescript">import { Injectable } from &#x27;@angular/core&#x27;;

import { factory } from &#x27;./js-sha256&#x27;;
// const sha256 &#x3D; factory();

import fsha256 from &#x27;./fast-sha256js&#x27;;

/**
 * Abstraction for crypto algorithms
 */
export abstract class HashHandler {
  abstract calcHash(valueToHash: string, algorithm: string): Promise&lt;string&gt;;
}

function decodeUTF8(s) {
  if (typeof s !&#x3D;&#x3D; &#x27;string&#x27;) throw new TypeError(&#x27;expected string&#x27;);
  const d &#x3D; s,
    b &#x3D; new Uint8Array(d.length);
  for (let i &#x3D; 0; i &lt; d.length; i++) b[i] &#x3D; d.charCodeAt(i);
  return b;
}

function encodeUTF8(arr) {
  const s &#x3D; [];
  for (let i &#x3D; 0; i &lt; arr.length; i++) s.push(String.fromCharCode(arr[i]));
  return s.join(&#x27;&#x27;);
}

@Injectable()
export class DefaultHashHandler implements HashHandler {
  async calcHash(valueToHash: string, algorithm: string): Promise&lt;string&gt; {
    // const encoder &#x3D; new TextEncoder();
    // const hashArray &#x3D; await window.crypto.subtle.digest(algorithm, data);
    // const data &#x3D; encoder.encode(valueToHash);

    // const fhash &#x3D; fsha256(valueToHash);

    const candHash &#x3D; encodeUTF8(fsha256(decodeUTF8(valueToHash)));

    // const hashArray &#x3D; (sha256 as any).array(valueToHash);
    // // const hashString &#x3D; this.toHashString(hashArray);
    // const hashString &#x3D; this.toHashString2(hashArray);

    // console.debug(&#x27;hash orig - cand&#x27;, candHash, hashString);
    // alert(1);

    return candHash;
  }

  toHashString2(byteArray: number[]) {
    let result &#x3D; &#x27;&#x27;;
    for (const e of byteArray) {
      result +&#x3D; String.fromCharCode(e);
    }
    return result;
  }

  toHashString(buffer: ArrayBuffer) {
    const byteArray &#x3D; new Uint8Array(buffer);
    let result &#x3D; &#x27;&#x27;;
    for (const e of byteArray) {
      result +&#x3D; String.fromCharCode(e);
    }
    return result;
  }

  // hexString(buffer) {
  //     const byteArray &#x3D; new Uint8Array(buffer);
  //     const hexCodes &#x3D; [...byteArray].map(value &#x3D;&gt; {
  //       const hexCode &#x3D; value.toString(16);
  //       const paddedHexCode &#x3D; hexCode.padStart(2, &#x27;0&#x27;);
  //       return paddedHexCode;
  //     });

  //     return hexCodes.join(&#x27;&#x27;);
  //   }

  // toHashString(hexString: string) {
  //   let result &#x3D; &#x27;&#x27;;
  //   for (let i &#x3D; 0; i &lt; hexString.length; i +&#x3D; 2) {
  //     let hexDigit &#x3D; hexString.charAt(i) + hexString.charAt(i + 1);
  //     let num &#x3D; parseInt(hexDigit, 16);
  //     result +&#x3D; String.fromCharCode(num);
  //   }
  //   return result;
  // }
}
</code></pre>
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